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【单选题】
用反证法证明命题“设 为实数，则方程 至少有一个实根”时，要做的假设是（ ）A.
方程 没有实根
B.
方程 至多有一个实根
C.
方程 至多有两个实根
D.
方程 恰好有两个实根
拍照语音搜题，微信中搜索"皮皮学"使用
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